一位同学用低倍镜观察自制的细胞装片时，发现视野有一异物，移动装片，异物不动，换高倍物镜后，异物仍在，这异物可能在（   ）

阅读下面短文，把A---D四个句子填入文中空缺处，使短文内容完整、正确。

    I'm Lin Tao. I live in a beautiful apartment.____ There are eight floors in the building and there is a parking lot near it. We park our cars there.
    Our apartment is in the countrysides. ____  It's four kilometers from the center of the city. My father works in the city, and he goes to work by car every day.
____  One is for my parents. One is me and another for my brother. We don't have a garden, but there is a small balcony(阳台).

____ I often water the flowers with my brother. Our apartment is small but we are very happy in it. I love my home.
____ What is the best title （标题）for the passage?
 A. My family      B. My home       C.  My father

近年来，我国在很多地方开展了禁用一次性筷子的活动，开展这一活动的直接目的是（   ）